This was a gift to my father from a Doctor in California over 20 years ago. I unscrewed and pulled out the stem to set it at 8:00 and it has been running now for over 30 minutes. It is marked inside the around the movements; Montres Rolex S.A. Geneva Swiss, 26 Jewels Temperature adjusted 5 positions . D036083 is on the rim of the works. I couldn't get the band off to see the serial # 9:00 still running. If you have any questions please let me know.This is a "as is" item, I know nothing about it other than what is pictured,or what I have been able to look thought the loop and copy .I forgot to mention a tiny, I guess chip on the crystal at the 5 We have a bunch of great things for the whole family; a lot of designer clothes at great prices and much more. I try to list only high quality new and used items. I am always happy to combine shipping cost.Only $2 for additional clothing items up to 4 pieces them only $1 for items 5 - however many you want.(Int. shipping by weight) Smoke + Pet Free home. I do not do refunds because of the high cost of shipping ,so please read all details and measurements carefully . On International shipping there will be a $12.95 registered mail /tracking fee added to all items priced over $24.95.We are listing new things all the time so please..